Does anyone know why those lines come out in the video and how can I eliminate that problem ??

I am guessing the flicker from the fluorescent lighting: http://www.untamedscience.com/fi ... fluorescent-lights/

Try a different shutter speed.  Dan is probably correct.   Florescent lights are not as they appear.  Instead of constantly on, they flicker really fast.  Many LED lights (and others) flicker too.  But they flicker so quickly our eyes don't notice.  But when you have a video camera that is shooting at roughly the same frequency as the flicker, you see black bars.

dancopter Posted at 2017-7-9 20:23
I am guessing the flicker from the fluorescent lighting: http://www.untamedscience.com/filmmaking/production-shooting/flickering-video-fluorescent-lights/

Thanks, it's already resolved !!

Mabou2 Posted at 2017-7-10 06:22
Try a different shutter speed.  Dan is probably correct.   Florescent lights are not as they appear.  Instead of constantly on, they flicker really fast.  Many LED lights (and others) flicker too.  But they flicker so quickly our eyes don't notice.  But when you have a video camera that is shooting at roughly the same frequency as the flicker, you see black bars.

Yes that's why, it's already resolved, thanks